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en:manuel_reference:methode_micro:verif_habby [2021/12/01 15:46] – ylecoarer | en:manuel_reference:methode_micro:verif_habby [2021/12/02 10:37] – ylecoarer | ||
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For a given variable, and for discrete values of the latter, the biological model provides suitability index SI given values between 0 and 1, qualifying the ' | For a given variable, and for discrete values of the latter, the biological model provides suitability index SI given values between 0 and 1, qualifying the ' | ||
- | Equation (1) allows the calculation of the habitat suitability index $\mathit{HSI_i}$ in a mesh of index i and area Ai of a hydraulic model, from the mean values of the variables (H,V,S) of this mesh noted $\mathit{H_i, | + | Equation (1) is used to calculate |
(1a) \[HSI_i=SI_H(H_i)\times SI_V(V_i)\times SI_S(S_i)\] | (1a) \[HSI_i=SI_H(H_i)\times SI_V(V_i)\times SI_S(S_i)\] | ||
(1b) \[HSI_i=(SI_H(H_i)\times SI_V(V_i)\times SI_S(S_i))^\frac{1}{3}\] | (1b) \[HSI_i=(SI_H(H_i)\times SI_V(V_i)\times SI_S(S_i))^\frac{1}{3}\] | ||
- | (1c) \[HSI_i=\frac{SI_H(H_i)\times SI_V(V_i)\times | + | (1c) \[HSI_i=\frac{SI_H(H_i)+ SI_V(V_i)+ SI_S(S_i)}{3}\] |
- | (2) \[WUA=sum_{i=1}^M | + | |
- | (3) \[OSI=frac{WUA}{sum_{i=1}^M A_i}\] | + | In case the user decides to use only two variables for example (H,V), these equations are adapted in HABBY and become : |
+ | |||
+ | (1_a2) \[HSI_i=SI_H(H_i)\times SI_V(V_i)\] | ||
+ | (1_b2) \[HSI_i=(SI_H(H_i)\times | ||
+ | (1_c2) \[HSI_i=frac{SI_H(H_i)+ SI_V(V_i)}{2}\] | ||
+ | |||
+ | The logics (a) product, (b) geometric mean and (c) mean are respected. | ||
+ | |||
+ | In the case where the biological model is bivariate (H,V) equation (1) is written : | ||
+ | |||
+ | (1_biv) \[HSI_i=SI_{H, | ||
+ | |||
+ | |||
+ | (2) \[WUA=\sum_{i=1}^M | ||
+ | (3) \[OSI=\frac{WUA}{\sum_{i=1}^M A_i}\] | ||
(4) \[{SI_{i, | (4) \[{SI_{i, | ||